Patchwork [05/11] ide/atapi: Factor commands out

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Submitter Kevin Wolf
Date April 27, 2011, 1:43 p.m.
Message ID <1303911790-27422-6-git-send-email-kwolf@redhat.com>
Download mbox | patch
Permalink /patch/93060/
State New
Headers show

Comments

Kevin Wolf - April 27, 2011, 1:43 p.m.
In preparation for a table of function pointers, factor each command out from
ide_atapi_cmd() into its own function.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/ide/atapi.c |  837 +++++++++++++++++++++++++++++++-------------------------
 1 files changed, 459 insertions(+), 378 deletions(-)

Patch

diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index 5e75efe..dc97b16 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -621,11 +621,453 @@  static void handle_get_event_status_notification(IDEState *s,
     ide_atapi_cmd_reply(s, used_len, max_len);
 }
 
+static void cmd_request_sense(IDEState *s, uint8_t *buf)
+{
+    int max_len = buf[4];
+
+    memset(buf, 0, 18);
+    buf[0] = 0x70 | (1 << 7);
+    buf[2] = s->sense_key;
+    buf[7] = 10;
+    buf[12] = s->asc;
+
+    if (s->sense_key == SENSE_UNIT_ATTENTION) {
+        s->sense_key = SENSE_NONE;
+    }
+
+    ide_atapi_cmd_reply(s, 18, max_len);
+}
+
+static void cmd_inquiry(IDEState *s, uint8_t *buf)
+{
+    int max_len = buf[4];
+
+    buf[0] = 0x05; /* CD-ROM */
+    buf[1] = 0x80; /* removable */
+    buf[2] = 0x00; /* ISO */
+    buf[3] = 0x21; /* ATAPI-2 (XXX: put ATAPI-4 ?) */
+    buf[4] = 31; /* additional length */
+    buf[5] = 0; /* reserved */
+    buf[6] = 0; /* reserved */
+    buf[7] = 0; /* reserved */
+    padstr8(buf + 8, 8, "QEMU");
+    padstr8(buf + 16, 16, "QEMU DVD-ROM");
+    padstr8(buf + 32, 4, s->version);
+    ide_atapi_cmd_reply(s, 36, max_len);
+}
+
+static void cmd_get_configuration(IDEState *s, uint8_t *buf)
+{
+    uint32_t len;
+    uint8_t index = 0;
+    int max_len;
+
+    /* only feature 0 is supported */
+    if (buf[2] != 0 || buf[3] != 0) {
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+        return;
+    }
+
+    /* XXX: could result in alignment problems in some architectures */
+    max_len = ube16_to_cpu(buf + 7);
+
+    /*
+     * XXX: avoid overflow for io_buffer if max_len is bigger than
+     *      the size of that buffer (dimensioned to max number of
+     *      sectors to transfer at once)
+     *
+     *      Only a problem if the feature/profiles grow.
+     */
+    if (max_len > 512) {
+        /* XXX: assume 1 sector */
+        max_len = 512;
+    }
+
+    memset(buf, 0, max_len);
+    /*
+     * the number of sectors from the media tells us which profile
+     * to use as current.  0 means there is no media
+     */
+    if (media_is_dvd(s)) {
+        cpu_to_ube16(buf + 6, MMC_PROFILE_DVD_ROM);
+    } else if (media_is_cd(s)) {
+        cpu_to_ube16(buf + 6, MMC_PROFILE_CD_ROM);
+    }
+
+    buf[10] = 0x02 | 0x01; /* persistent and current */
+    len = 12; /* headers: 8 + 4 */
+    len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
+    len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
+    cpu_to_ube32(buf, len - 4); /* data length */
+
+    ide_atapi_cmd_reply(s, len, max_len);
+}
+
+static void cmd_mode_sense(IDEState *s, uint8_t *buf)
+{
+    int action, code;
+    int max_len;
+
+    if (buf[0] == GPCMD_MODE_SENSE_10) {
+        max_len = ube16_to_cpu(buf + 7);
+    } else {
+        max_len = buf[4];
+    }
+
+    action = buf[2] >> 6;
+    code = buf[2] & 0x3f;
+
+    switch(action) {
+    case 0: /* current values */
+        switch(code) {
+        case GPMODE_R_W_ERROR_PAGE: /* error recovery */
+            cpu_to_ube16(&buf[0], 16 + 6);
+            buf[2] = 0x70;
+            buf[3] = 0;
+            buf[4] = 0;
+            buf[5] = 0;
+            buf[6] = 0;
+            buf[7] = 0;
+
+            buf[8] = 0x01;
+            buf[9] = 0x06;
+            buf[10] = 0x00;
+            buf[11] = 0x05;
+            buf[12] = 0x00;
+            buf[13] = 0x00;
+            buf[14] = 0x00;
+            buf[15] = 0x00;
+            ide_atapi_cmd_reply(s, 16, max_len);
+            break;
+        case GPMODE_AUDIO_CTL_PAGE:
+            cpu_to_ube16(&buf[0], 24 + 6);
+            buf[2] = 0x70;
+            buf[3] = 0;
+            buf[4] = 0;
+            buf[5] = 0;
+            buf[6] = 0;
+            buf[7] = 0;
+
+            /* Fill with CDROM audio volume */
+            buf[17] = 0;
+            buf[19] = 0;
+            buf[21] = 0;
+            buf[23] = 0;
+
+            ide_atapi_cmd_reply(s, 24, max_len);
+            break;
+        case GPMODE_CAPABILITIES_PAGE:
+            cpu_to_ube16(&buf[0], 28 + 6);
+            buf[2] = 0x70;
+            buf[3] = 0;
+            buf[4] = 0;
+            buf[5] = 0;
+            buf[6] = 0;
+            buf[7] = 0;
+
+            buf[8] = 0x2a;
+            buf[9] = 0x12;
+            buf[10] = 0x00;
+            buf[11] = 0x00;
+
+            /* Claim PLAY_AUDIO capability (0x01) since some Linux
+               code checks for this to automount media. */
+            buf[12] = 0x71;
+            buf[13] = 3 << 5;
+            buf[14] = (1 << 0) | (1 << 3) | (1 << 5);
+            if (bdrv_is_locked(s->bs))
+                buf[6] |= 1 << 1;
+            buf[15] = 0x00;
+            cpu_to_ube16(&buf[16], 706);
+            buf[18] = 0;
+            buf[19] = 2;
+            cpu_to_ube16(&buf[20], 512);
+            cpu_to_ube16(&buf[22], 706);
+            buf[24] = 0;
+            buf[25] = 0;
+            buf[26] = 0;
+            buf[27] = 0;
+            ide_atapi_cmd_reply(s, 28, max_len);
+            break;
+        default:
+            goto error_cmd;
+        }
+        break;
+    case 1: /* changeable values */
+        goto error_cmd;
+    case 2: /* default values */
+        goto error_cmd;
+    default:
+    case 3: /* saved values */
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_SAVING_PARAMETERS_NOT_SUPPORTED);
+        break;
+    }
+    return;
+
+error_cmd:
+    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, ASC_INV_FIELD_IN_CMD_PACKET);
+}
+
+static void cmd_test_unit_ready(IDEState *s, uint8_t *buf)
+{
+    if (bdrv_is_inserted(s->bs)) {
+        ide_atapi_cmd_ok(s);
+    } else {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+    }
+}
+
+static void cmd_prevent_allow_medium_removal(IDEState *s, uint8_t* buf)
+{
+    bdrv_set_locked(s->bs, buf[4] & 1);
+    ide_atapi_cmd_ok(s);
+}
+
+static void cmd_read(IDEState *s, uint8_t* buf)
+{
+    int nb_sectors, lba;
+
+    if (buf[0] == GPCMD_READ_10) {
+        nb_sectors = ube16_to_cpu(buf + 7);
+    } else {
+        nb_sectors = ube32_to_cpu(buf + 6);
+    }
+
+    lba = ube32_to_cpu(buf + 2);
+    if (nb_sectors == 0) {
+        ide_atapi_cmd_ok(s);
+        return;
+    }
+
+    ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
+}
+
+static void cmd_read_cd(IDEState *s, uint8_t* buf)
+{
+    int nb_sectors, lba, transfer_request;
+
+    nb_sectors = (buf[6] << 16) | (buf[7] << 8) | buf[8];
+    lba = ube32_to_cpu(buf + 2);
+
+    if (nb_sectors == 0) {
+        ide_atapi_cmd_ok(s);
+        return;
+    }
+
+    transfer_request = buf[9];
+    switch(transfer_request & 0xf8) {
+    case 0x00:
+        /* nothing */
+        ide_atapi_cmd_ok(s);
+        break;
+    case 0x10:
+        /* normal read */
+        ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
+        break;
+    case 0xf8:
+        /* read all data */
+        ide_atapi_cmd_read(s, lba, nb_sectors, 2352);
+        break;
+    default:
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+        break;
+    }
+}
+
+static void cmd_seek(IDEState *s, uint8_t* buf)
+{
+    unsigned int lba;
+    uint64_t total_sectors;
+
+    bdrv_get_geometry(s->bs, &total_sectors);
+
+    total_sectors >>= 2;
+    if (total_sectors == 0) {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+        return;
+    }
+
+    lba = ube32_to_cpu(buf + 2);
+    if (lba >= total_sectors) {
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);
+        return;
+    }
+
+    ide_atapi_cmd_ok(s);
+}
+
+static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)
+{
+    int start, eject, sense, err = 0;
+    start = buf[4] & 1;
+    eject = (buf[4] >> 1) & 1;
+
+    if (eject) {
+        err = bdrv_eject(s->bs, !start);
+    }
+
+    switch (err) {
+    case 0:
+        ide_atapi_cmd_ok(s);
+        break;
+    case -EBUSY:
+        sense = SENSE_NOT_READY;
+        if (bdrv_is_inserted(s->bs)) {
+            sense = SENSE_ILLEGAL_REQUEST;
+        }
+        ide_atapi_cmd_error(s, sense, ASC_MEDIA_REMOVAL_PREVENTED);
+        break;
+    default:
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+        break;
+    }
+}
+
+static void cmd_mechanism_status(IDEState *s, uint8_t* buf)
+{
+    int max_len = ube16_to_cpu(buf + 8);
+
+    cpu_to_ube16(buf, 0);
+    /* no current LBA */
+    buf[2] = 0;
+    buf[3] = 0;
+    buf[4] = 0;
+    buf[5] = 1;
+    cpu_to_ube16(buf + 6, 0);
+    ide_atapi_cmd_reply(s, 8, max_len);
+}
+
+static void cmd_read_toc_pma_atip(IDEState *s, uint8_t* buf)
+{
+    int format, msf, start_track, len;
+    uint64_t total_sectors;
+    int max_len;
+
+    bdrv_get_geometry(s->bs, &total_sectors);
+
+    total_sectors >>= 2;
+    if (total_sectors == 0) {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+        return;
+    }
+
+    max_len = ube16_to_cpu(buf + 7);
+    format = buf[9] >> 6;
+    msf = (buf[1] >> 1) & 1;
+    start_track = buf[6];
+
+    switch(format) {
+    case 0:
+        len = cdrom_read_toc(total_sectors, buf, msf, start_track);
+        if (len < 0)
+            goto error_cmd;
+        ide_atapi_cmd_reply(s, len, max_len);
+        break;
+    case 1:
+        /* multi session : only a single session defined */
+        memset(buf, 0, 12);
+        buf[1] = 0x0a;
+        buf[2] = 0x01;
+        buf[3] = 0x01;
+        ide_atapi_cmd_reply(s, 12, max_len);
+        break;
+    case 2:
+        len = cdrom_read_toc_raw(total_sectors, buf, msf, start_track);
+        if (len < 0)
+            goto error_cmd;
+        ide_atapi_cmd_reply(s, len, max_len);
+        break;
+    default:
+    error_cmd:
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+    }
+}
+
+static void cmd_read_cdvd_capacity(IDEState *s, uint8_t* buf)
+{
+    uint64_t total_sectors;
+
+    bdrv_get_geometry(s->bs, &total_sectors);
+
+    total_sectors >>= 2;
+    if (total_sectors == 0) {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+        return;
+    }
+
+    /* NOTE: it is really the number of sectors minus 1 */
+    cpu_to_ube32(buf, total_sectors - 1);
+    cpu_to_ube32(buf + 4, 2048);
+    ide_atapi_cmd_reply(s, 8, 8);
+}
+
+static void cmd_read_dvd_structure(IDEState *s, uint8_t* buf)
+{
+    int max_len;
+    int media = buf[1];
+    int format = buf[7];
+    int ret;
+
+    max_len = ube16_to_cpu(buf + 8);
+
+    if (format < 0xff) {
+        if (media_is_cd(s)) {
+            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                                ASC_INCOMPATIBLE_FORMAT);
+            return;
+        } else if (!media_present(s)) {
+            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                                ASC_INV_FIELD_IN_CMD_PACKET);
+            return;
+        }
+    }
+
+    memset(buf, 0, max_len > IDE_DMA_BUF_SECTORS * 512 + 4 ?
+           IDE_DMA_BUF_SECTORS * 512 + 4 : max_len);
+
+    switch (format) {
+        case 0x00 ... 0x7f:
+        case 0xff:
+            if (media == 0) {
+                ret = ide_dvd_read_structure(s, format, buf, buf);
+
+                if (ret < 0) {
+                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, -ret);
+                } else {
+                    ide_atapi_cmd_reply(s, ret, max_len);
+                }
+
+                break;
+            }
+            /* TODO: BD support, fall through for now */
+
+        /* Generic disk structures */
+        case 0x80: /* TODO: AACS volume identifier */
+        case 0x81: /* TODO: AACS media serial number */
+        case 0x82: /* TODO: AACS media identifier */
+        case 0x83: /* TODO: AACS media key block */
+        case 0x90: /* TODO: List of recognized format layers */
+        case 0xc0: /* TODO: Write protection status */
+        default:
+            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                                ASC_INV_FIELD_IN_CMD_PACKET);
+            break;
+    }
+}
+
+static void cmd_set_speed(IDEState *s, uint8_t* buf)
+{
+    ide_atapi_cmd_ok(s);
+}
+
 void ide_atapi_cmd(IDEState *s)
 {
     const uint8_t *packet;
     uint8_t *buf;
-    int max_len;
 
     packet = s->io_buffer;
     buf = s->io_buffer;
@@ -665,413 +1107,52 @@  void ide_atapi_cmd(IDEState *s)
     }
     switch(s->io_buffer[0]) {
     case GPCMD_TEST_UNIT_READY:
-        if (bdrv_is_inserted(s->bs)) {
-            ide_atapi_cmd_ok(s);
-        } else {
-            ide_atapi_cmd_error(s, SENSE_NOT_READY,
-                                ASC_MEDIUM_NOT_PRESENT);
-        }
+        cmd_test_unit_ready(s, buf);
         break;
     case GPCMD_MODE_SENSE_6:
     case GPCMD_MODE_SENSE_10:
-        {
-            int action, code;
-            if (packet[0] == GPCMD_MODE_SENSE_10)
-                max_len = ube16_to_cpu(packet + 7);
-            else
-                max_len = packet[4];
-            action = packet[2] >> 6;
-            code = packet[2] & 0x3f;
-            switch(action) {
-            case 0: /* current values */
-                switch(code) {
-                case GPMODE_R_W_ERROR_PAGE: /* error recovery */
-                    cpu_to_ube16(&buf[0], 16 + 6);
-                    buf[2] = 0x70;
-                    buf[3] = 0;
-                    buf[4] = 0;
-                    buf[5] = 0;
-                    buf[6] = 0;
-                    buf[7] = 0;
-
-                    buf[8] = 0x01;
-                    buf[9] = 0x06;
-                    buf[10] = 0x00;
-                    buf[11] = 0x05;
-                    buf[12] = 0x00;
-                    buf[13] = 0x00;
-                    buf[14] = 0x00;
-                    buf[15] = 0x00;
-                    ide_atapi_cmd_reply(s, 16, max_len);
-                    break;
-                case GPMODE_AUDIO_CTL_PAGE:
-                    cpu_to_ube16(&buf[0], 24 + 6);
-                    buf[2] = 0x70;
-                    buf[3] = 0;
-                    buf[4] = 0;
-                    buf[5] = 0;
-                    buf[6] = 0;
-                    buf[7] = 0;
-
-                    /* Fill with CDROM audio volume */
-                    buf[17] = 0;
-                    buf[19] = 0;
-                    buf[21] = 0;
-                    buf[23] = 0;
-
-                    ide_atapi_cmd_reply(s, 24, max_len);
-                    break;
-                case GPMODE_CAPABILITIES_PAGE:
-                    cpu_to_ube16(&buf[0], 28 + 6);
-                    buf[2] = 0x70;
-                    buf[3] = 0;
-                    buf[4] = 0;
-                    buf[5] = 0;
-                    buf[6] = 0;
-                    buf[7] = 0;
-
-                    buf[8] = 0x2a;
-                    buf[9] = 0x12;
-                    buf[10] = 0x00;
-                    buf[11] = 0x00;
-
-                    /* Claim PLAY_AUDIO capability (0x01) since some Linux
-                       code checks for this to automount media. */
-                    buf[12] = 0x71;
-                    buf[13] = 3 << 5;
-                    buf[14] = (1 << 0) | (1 << 3) | (1 << 5);
-                    if (bdrv_is_locked(s->bs))
-                        buf[6] |= 1 << 1;
-                    buf[15] = 0x00;
-                    cpu_to_ube16(&buf[16], 706);
-                    buf[18] = 0;
-                    buf[19] = 2;
-                    cpu_to_ube16(&buf[20], 512);
-                    cpu_to_ube16(&buf[22], 706);
-                    buf[24] = 0;
-                    buf[25] = 0;
-                    buf[26] = 0;
-                    buf[27] = 0;
-                    ide_atapi_cmd_reply(s, 28, max_len);
-                    break;
-                default:
-                    goto error_cmd;
-                }
-                break;
-            case 1: /* changeable values */
-                goto error_cmd;
-            case 2: /* default values */
-                goto error_cmd;
-            default:
-            case 3: /* saved values */
-                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                    ASC_SAVING_PARAMETERS_NOT_SUPPORTED);
-                break;
-            }
-        }
+        cmd_mode_sense(s, buf);
         break;
     case GPCMD_REQUEST_SENSE:
-        max_len = packet[4];
-        memset(buf, 0, 18);
-        buf[0] = 0x70 | (1 << 7);
-        buf[2] = s->sense_key;
-        buf[7] = 10;
-        buf[12] = s->asc;
-        if (s->sense_key == SENSE_UNIT_ATTENTION)
-            s->sense_key = SENSE_NONE;
-        ide_atapi_cmd_reply(s, 18, max_len);
+        cmd_request_sense(s, buf);
         break;
     case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
-        bdrv_set_locked(s->bs, packet[4] & 1);
-        ide_atapi_cmd_ok(s);
+        cmd_prevent_allow_medium_removal(s, buf);
         break;
     case GPCMD_READ_10:
     case GPCMD_READ_12:
-        {
-            int nb_sectors, lba;
-
-            if (packet[0] == GPCMD_READ_10)
-                nb_sectors = ube16_to_cpu(packet + 7);
-            else
-                nb_sectors = ube32_to_cpu(packet + 6);
-            lba = ube32_to_cpu(packet + 2);
-            if (nb_sectors == 0) {
-                ide_atapi_cmd_ok(s);
-                break;
-            }
-            ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
-        }
+        cmd_read(s, buf);
         break;
     case GPCMD_READ_CD:
-        {
-            int nb_sectors, lba, transfer_request;
-
-            nb_sectors = (packet[6] << 16) | (packet[7] << 8) | packet[8];
-            lba = ube32_to_cpu(packet + 2);
-            if (nb_sectors == 0) {
-                ide_atapi_cmd_ok(s);
-                break;
-            }
-            transfer_request = packet[9];
-            switch(transfer_request & 0xf8) {
-            case 0x00:
-                /* nothing */
-                ide_atapi_cmd_ok(s);
-                break;
-            case 0x10:
-                /* normal read */
-                ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
-                break;
-            case 0xf8:
-                /* read all data */
-                ide_atapi_cmd_read(s, lba, nb_sectors, 2352);
-                break;
-            default:
-                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                    ASC_INV_FIELD_IN_CMD_PACKET);
-                break;
-            }
-        }
+        cmd_read_cd(s, buf);
         break;
     case GPCMD_SEEK:
-        {
-            unsigned int lba;
-            uint64_t total_sectors;
-
-            bdrv_get_geometry(s->bs, &total_sectors);
-            total_sectors >>= 2;
-            if (total_sectors == 0) {
-                ide_atapi_cmd_error(s, SENSE_NOT_READY,
-                                    ASC_MEDIUM_NOT_PRESENT);
-                break;
-            }
-            lba = ube32_to_cpu(packet + 2);
-            if (lba >= total_sectors) {
-                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                    ASC_LOGICAL_BLOCK_OOR);
-                break;
-            }
-            ide_atapi_cmd_ok(s);
-        }
+        cmd_seek(s, buf);
         break;
     case GPCMD_START_STOP_UNIT:
-        {
-            int start, eject, sense, err = 0;
-            start = packet[4] & 1;
-            eject = (packet[4] >> 1) & 1;
-
-            if (eject) {
-                err = bdrv_eject(s->bs, !start);
-            }
-
-            switch (err) {
-            case 0:
-                ide_atapi_cmd_ok(s);
-                break;
-            case -EBUSY:
-                sense = SENSE_NOT_READY;
-                if (bdrv_is_inserted(s->bs)) {
-                    sense = SENSE_ILLEGAL_REQUEST;
-                }
-                ide_atapi_cmd_error(s, sense,
-                                    ASC_MEDIA_REMOVAL_PREVENTED);
-                break;
-            default:
-                ide_atapi_cmd_error(s, SENSE_NOT_READY,
-                                    ASC_MEDIUM_NOT_PRESENT);
-                break;
-            }
-        }
+        cmd_start_stop_unit(s, buf);
         break;
     case GPCMD_MECHANISM_STATUS:
-        {
-            max_len = ube16_to_cpu(packet + 8);
-            cpu_to_ube16(buf, 0);
-            /* no current LBA */
-            buf[2] = 0;
-            buf[3] = 0;
-            buf[4] = 0;
-            buf[5] = 1;
-            cpu_to_ube16(buf + 6, 0);
-            ide_atapi_cmd_reply(s, 8, max_len);
-        }
+        cmd_mechanism_status(s, buf);
         break;
     case GPCMD_READ_TOC_PMA_ATIP:
-        {
-            int format, msf, start_track, len;
-            uint64_t total_sectors;
-
-            bdrv_get_geometry(s->bs, &total_sectors);
-            total_sectors >>= 2;
-            if (total_sectors == 0) {
-                ide_atapi_cmd_error(s, SENSE_NOT_READY,
-                                    ASC_MEDIUM_NOT_PRESENT);
-                break;
-            }
-            max_len = ube16_to_cpu(packet + 7);
-            format = packet[9] >> 6;
-            msf = (packet[1] >> 1) & 1;
-            start_track = packet[6];
-            switch(format) {
-            case 0:
-                len = cdrom_read_toc(total_sectors, buf, msf, start_track);
-                if (len < 0)
-                    goto error_cmd;
-                ide_atapi_cmd_reply(s, len, max_len);
-                break;
-            case 1:
-                /* multi session : only a single session defined */
-                memset(buf, 0, 12);
-                buf[1] = 0x0a;
-                buf[2] = 0x01;
-                buf[3] = 0x01;
-                ide_atapi_cmd_reply(s, 12, max_len);
-                break;
-            case 2:
-                len = cdrom_read_toc_raw(total_sectors, buf, msf, start_track);
-                if (len < 0)
-                    goto error_cmd;
-                ide_atapi_cmd_reply(s, len, max_len);
-                break;
-            default:
-            error_cmd:
-                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                    ASC_INV_FIELD_IN_CMD_PACKET);
-                break;
-            }
-        }
+        cmd_read_toc_pma_atip(s, buf);
         break;
     case GPCMD_READ_CDVD_CAPACITY:
-        {
-            uint64_t total_sectors;
-
-            bdrv_get_geometry(s->bs, &total_sectors);
-            total_sectors >>= 2;
-            if (total_sectors == 0) {
-                ide_atapi_cmd_error(s, SENSE_NOT_READY,
-                                    ASC_MEDIUM_NOT_PRESENT);
-                break;
-            }
-            /* NOTE: it is really the number of sectors minus 1 */
-            cpu_to_ube32(buf, total_sectors - 1);
-            cpu_to_ube32(buf + 4, 2048);
-            ide_atapi_cmd_reply(s, 8, 8);
-        }
+        cmd_read_cdvd_capacity(s, buf);
         break;
     case GPCMD_READ_DVD_STRUCTURE:
-        {
-            int media = packet[1];
-            int format = packet[7];
-            int ret;
-
-            max_len = ube16_to_cpu(packet + 8);
-
-            if (format < 0xff) {
-                if (media_is_cd(s)) {
-                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                        ASC_INCOMPATIBLE_FORMAT);
-                    break;
-                } else if (!media_present(s)) {
-                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                        ASC_INV_FIELD_IN_CMD_PACKET);
-                    break;
-                }
-            }
-
-            memset(buf, 0, max_len > IDE_DMA_BUF_SECTORS * 512 + 4 ?
-                   IDE_DMA_BUF_SECTORS * 512 + 4 : max_len);
-
-            switch (format) {
-                case 0x00 ... 0x7f:
-                case 0xff:
-                    if (media == 0) {
-                        ret = ide_dvd_read_structure(s, format, packet, buf);
-
-                        if (ret < 0)
-                            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, -ret);
-                        else
-                            ide_atapi_cmd_reply(s, ret, max_len);
-
-                        break;
-                    }
-                    /* TODO: BD support, fall through for now */
-
-                /* Generic disk structures */
-                case 0x80: /* TODO: AACS volume identifier */
-                case 0x81: /* TODO: AACS media serial number */
-                case 0x82: /* TODO: AACS media identifier */
-                case 0x83: /* TODO: AACS media key block */
-                case 0x90: /* TODO: List of recognized format layers */
-                case 0xc0: /* TODO: Write protection status */
-                default:
-                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                        ASC_INV_FIELD_IN_CMD_PACKET);
-                    break;
-            }
-        }
+        cmd_read_dvd_structure(s, buf);
         break;
     case GPCMD_SET_SPEED:
-        ide_atapi_cmd_ok(s);
+        cmd_set_speed(s, buf);
         break;
     case GPCMD_INQUIRY:
-        max_len = packet[4];
-        buf[0] = 0x05; /* CD-ROM */
-        buf[1] = 0x80; /* removable */
-        buf[2] = 0x00; /* ISO */
-        buf[3] = 0x21; /* ATAPI-2 (XXX: put ATAPI-4 ?) */
-        buf[4] = 31; /* additional length */
-        buf[5] = 0; /* reserved */
-        buf[6] = 0; /* reserved */
-        buf[7] = 0; /* reserved */
-        padstr8(buf + 8, 8, "QEMU");
-        padstr8(buf + 16, 16, "QEMU DVD-ROM");
-        padstr8(buf + 32, 4, s->version);
-        ide_atapi_cmd_reply(s, 36, max_len);
+        cmd_inquiry(s, buf);
         break;
     case GPCMD_GET_CONFIGURATION:
-        {
-            uint32_t len;
-            uint8_t index = 0;
-
-            /* only feature 0 is supported */
-            if (packet[2] != 0 || packet[3] != 0) {
-                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
-                                    ASC_INV_FIELD_IN_CMD_PACKET);
-                break;
-            }
-
-            /* XXX: could result in alignment problems in some architectures */
-            max_len = ube16_to_cpu(packet + 7);
-
-            /*
-             * XXX: avoid overflow for io_buffer if max_len is bigger than
-             *      the size of that buffer (dimensioned to max number of
-             *      sectors to transfer at once)
-             *
-             *      Only a problem if the feature/profiles grow.
-             */
-            if (max_len > 512) /* XXX: assume 1 sector */
-                max_len = 512;
-
-            memset(buf, 0, max_len);
-            /*
-             * the number of sectors from the media tells us which profile
-             * to use as current.  0 means there is no media
-             */
-            if (media_is_dvd(s))
-                cpu_to_ube16(buf + 6, MMC_PROFILE_DVD_ROM);
-            else if (media_is_cd(s))
-                cpu_to_ube16(buf + 6, MMC_PROFILE_CD_ROM);
-
-            buf[10] = 0x02 | 0x01; /* persistent and current */
-            len = 12; /* headers: 8 + 4 */
-            len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
-            len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
-            cpu_to_ube32(buf, len - 4); /* data length */
-
-            ide_atapi_cmd_reply(s, len, max_len);
-            break;
-        }
+        cmd_get_configuration(s, buf);
+        break;
     case GPCMD_GET_EVENT_STATUS_NOTIFICATION:
         handle_get_event_status_notification(s, buf, packet);
         break;